v7guy wrote:James, I was envisioning one of those motors where it looks like somebody eptied a tub of grease under the valve and cam covers. Basically blocking off everything and pressurizing the crank case.
DustinC1989 wrote:-50 was just the windchill, not sure if that could freeze the oil. Actual temp only reached about -20.
Could be wrong though.
Did you watch for visible leaks the second time?
navigator wrote:yeah, I did some googling too and see 15C not F but most of the hits are like you mention much cooler.
DustinC1989 wrote:-50 was just the windchill, not sure if that could freeze the oil. Actual temp only reached about -20.
???? Ok so if the oil was below is pour point and it will not flow would not the oil pump have a very hard time trying to pump the oil at all before the motor heats up? I should write myth busters on the subject and ask them to test it.dvanbramer88 wrote:Also oil doesn't freeze. It has what is called a pour point. Below the pour point it will not flow. Normal 10W-30 is -30*F And 5W-30 is -35*F. Synthetics can have pour points as low as -50*F or -60*F
JamesDowning wrote:navigator wrote:yeah, I did some googling too and see 15C not F but most of the hits are like you mention much cooler.
15 degrees C is 60 degrees F...DustinC1989 wrote:-50 was just the windchill, not sure if that could freeze the oil. Actual temp only reached about -20.
Physics lesson! Wind chill is similar to a wet bulb temperature reading, which factors in the effects of evaporation of water. Basically its just a normal "dry bulb" thermometer, with a bit of wet cloth around it. Interestingly, it actually does get colder than the dry bulb, which we commonly refer to as ambient temperature. The reason it gets colder is because water needs a certain amount of energy to evaporate, called the latent heat of vaporization. Same reason water cannot get hotter than the boiling point. As the wind gets faster, and the humidity level drops, it increases the rate of evaporation of water... and therefore lowers the wet bulb (or wind chill) temperature.
We had to replace some of our oil jobs from 2 oil to kerosene cause the "gel" temperature is -21 compared to 2 oil 32 F gel point. So I agreedvanbramer88 wrote:Also oil doesn't freeze. It has what is called a pour point. Below the pour point it will not flow. Normal 10W-30 is -30*F And 5W-30 is -35*F. Synthetics can have pour points as low as -50*F or -60*F
JamesDowning wrote:navigator wrote:yeah, I did some googling too and see 15C not F but most of the hits are like you mention much cooler.
15 degrees C is 60 degrees F...
JamesDowning wrote:How long are your drives? Have you taken drives longer than 10/20 minutes recently?